Corrosion is nowadays a very important factor influencing the global crisis of materials and energy and leading to large losses in the economies of all countries. Therefore, it is very important to take care of the protection of materials from corrosion. Through this work it is sought to show the immersion device or its design, the work will be composed of a theoretical and practical part. Through the theoretical part of the paper, it will be described how corrosion affects materials and explain in more detail the reaction and mechanism of individual types of corrosion. In particular, efforts will be made to describe the corrosion that occurs in the reaction with aqueous solutions as this will be later examined through immersion. Likewise, through the paper, certain standards were analyzed according to which the method of testing the material is determined. With regard to these standards, the construction of the immersion test device was first approached. A practical part of the work was made through the Solidworks program and the design of an immersion corrosion testing device. The device was designed at the premises of the University of Slavonski Brod.